If the virtual machine has Snapshots the following notification window will appear. Press Manage Snapshots... to open the corresponding dialogue window then remove Snapshots to start editing the disk size.

Choose the size you want for the virtual hard disk and click Apply.

After that Parallels Desktop will suggest creating a backup of the virtual machine.
To proceed further click Continue.

NOTE: As mentioned above, we strongly recommend to create a backup of the virtual machine. In case of power surges/failures with the Mac, Mac's unpredictable restarts or third-party applications interventions, during the operations with the virtual hard drive may result in its corruption result in in the inability to use the virtual machine.

To make sure the changes were applied successfully, confirm that the size of the virtual hard disk has changed:

Start the virtual machine.

Right-click on the Start menu > Disk Management.

The size of the main partition (the partition where the Windows installation is located—it is local disk (C:) by default) should equal the size of the virtual hard disk (Hard Disk 1).

If the size of Hard Disk in the virtual machine’s configuration has changed and at the same time the size of the local disk (C:) in Windows has not, do the following:

Repeat steps mentioned above to open Disk Management.

Disk Management reports that you now have an extra partition on the hard drive that’s marked as Unallocated. You can add this Unallocated partition manually to your main disk (C:) partition:

Right-click on the main (C:) partition and select Extend Volume.

Extend Volume Wizard will open. Click Next.

On the Select Disk page, you may choose how much extra space should be added to the main (C:) partition. By default, the whole Unallocated partition will be added. Click Next.

Click Finish on the next page, and the Unallocated partition will be added to the (C:) partition.

Click Start and type This/this and click on the suggested This PC Desktop app.

Right-click on the C: drive and select Properties.

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